ggfat

This plugin automatically offers a discount coupon for every purchase made by setting a expiration date in days. 
This plugin manages to automatically give customers a coupon for each purchase they do so as to entice them to make the next purchase. You can set the discount percentage, the days of validity, the description of the coupon and you can send everything via email. Then you can enter the subject and body of the email.
Truly wonderful.

WC Give a Coupon

Grazie a questo plugin sono riuscito a dare automaticamente ai miei clienti un coupon per ogni acquisto che facevano così da invogliarli a fare il prossimo acquisto.

Wonderful

A plugin that automatically offers a discount coupon for every purchase made by setting a deadline.

WooPOS

WooPOS Gift Cards for WooCommerce is a plugin which allows you to manage and sell gift cards. Gift cards will be created and sent automatically from your website. You can sell them online or in your physical store, it will then allow your customers to redeem gift card on the site or your physical store using WooPOS.
This plugin is created by <a href="http://woopos.com/" rel="nofollow ugc">WooPOS</a>, an all-in-one top-class Windows Desktop App for Point Of Sale (POS). From inventory management to data analytics, sales processing and employee management, WooPOS (WooCommerce POS) will help you manage your single or multiple location retail brick-and-mortar stores and online WooCommerce store. Build-in features: WooCommerce stock manager, WooCommerce shop manager, WooCommerce frontend manager, multi vendor, multi store, split payment, purchase order, average cost, employee commission, clerk permission, barcode designer and printing, product sales report, offline sales, cloud database, CRM loyalty points, rewards, store credit, gift card…and much much more.

WooPOS Gift Cards for WooCommerce

WooPOS Gift Cards for WooCommerce allows your customers to purchase and redeem gift cards in both online store and physical stores.

WC Give a Coupon vs WooPOS Gift Cards for WooCommerce